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passive infrared
The passive infrared (PIR) motion detector is one of the most common sensors found in household and small business environments. it works entirely by detecting the heat energy given off by other objects. it works entirely by detecting the heat energy given off by other objects.
This device emits microwaves from a transmitter and detects any reflected microwaves or reduction in beam intensity using a receiver. To reduce false alarms this type of detector is usually combined with a passive infrared detector.It is usually installed with an automatic sliding door.
Photoelectric beam systems detect the presence of an intruder by transmitting visible or infrared light beams across an area, where these beams may be obstructed. To improve the detection surface area, the beams are often employed in stacks of two or more.
Most systems may also be equipped with smoke, heat, and/or carbon monoxide detectors. Smoke detectors and heat detectors protect from the risk of fire and carbon monoxide detectors protect from the risk of carbon monoxide.
This buried security system is based on the Magnetic Anomaly Detection principle of operation. The system uses an electromagnetic field generator powered by two wires running in parallel. Both wires run along the perimeter and are usually installed about 5"/12cm apart on top of a wall or about 12"/30cm below ground. Thewires are connected to a signal processor which analyzes any change in the magnetic field.
